某面板堆石坝应力及变形的有限元分析

基于邓肯-张E-B模型,建立了某面板堆石坝的有限元计算模型,获得了施工期、正常蓄水期和水位骤降期的坝体、面板应力及变形的分布和变化规律.结果表明:该混凝土面板堆石坝的坝体应力及变形性状正常,变形值在可接受范围内;坝体发生剪切破坏的可能性较小;趾板下覆的坝基较小范围内,存在应力集中和小主应力方向受拉的现象;库水位的大幅度变化对面板的挠度影响明显;坝基中断层只是对坝基的应力分布形态有影响,对坝体的应力变形影响微弱.

Non-linear Finite Element Analysis for Stress-deformation of a CFRD

Based on Duncan-Zhang＇s E-B constitutive material model, a finite element calculating model for a CFRD is established, and the stress-strain distribution and variation rule at the dam and the face slab during the construction period, water store period and water rapid-drawdown period are obtained. The calculation results show that： the stress-deformation behavior of the dam is normal, the deformation values are within the acceptable range; the shear failure for the dam is almost impossible; stress concentration and tensile loading on small principal stress exist on a small range of the dam foundation covered by toe slab ; the substantially change of water level has a great effect on the deformation and camber of the face slabs ; the fault structures in dam foundation only affect the stress distribution pattern of the foundation, but has a weak impact on the stress deformation of the dam body.